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President-elect Donald Trump has said he planned to appoint retired Marines General James ‘Maddog’ Mattis as Secretary of Defense on December 5. Trump said made the announcement during a December 1 victory rally stop in Cincinnati, Ohio. In this video released October 13 and shared via the United States Marines YouTube page, Mattis shares his leadership lessons, based on questions submitted. He shares his attack stories, how he stays motivated and general tips. Credit: YouTube/Marines via Storyful